Why Is My Furnace Blowing Cold Air?

December 12, 2018
By
Rusk Heating & Cooling

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Why Is My Furnace Blowing Cold Air?

If your furnace starts blowing cold air then it’s time to start investigating.
The last thing you want to happen is in the middle of a cold day to discover
that the furnace is having problems, but sometimes it does happen, and
there are a number of reasons for it.

Check that the thermostat is on – Even though the fan is running maybe the heater is not blowing
hot air, and as a result, any air that blows out of the vents when the
heater is off will feel cold. If the thermostat setting is the problem
then the solution is easy: Make sure that the thermostat is ON. When restored
to the correct setting, your furnace should start blowing warm air again.

The furnace overheated – If the furnace blows hot air, and then cold air, but then it stops
altogether, then it could be possible that it is overheated. In this case,
the furnace safety device turned its burners off. In most cases, the furnace
overheats because of a dirty furnace air filter. The problem is not to
be ignored, because frequent overheating could damage the heat exchanger,
which would get hurtful for your budget once you have to replace it. Replacing
the air filter is the best solution.

The pilot light might be out – In this case, the heater is not lighting the fuel. In order to
confirm that this is the problem, try to relight it according to your
heater’s instruction. If relighting it doesn’t work, check
the gas supply to make sure the gas valve is on. Otherwise, there is a
change that you have a dirty pilot light which needs to be cleaned in
order to make sure that the gas flows properly.

These are the 3 main issues that are most likely but are not the only possible
options. The heater could have inadequate gas supply (in which case the
gas is either turned off or not supplying enough gas), there could be
duct problems or condensate clogs. In any case, if you want to learn more
about this issue and what you need to do, check out our
site to see more.